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PHYSIOLOGICAL ASPECTS OF SOME RICE VARIETIES UNDER SYSTEM OF RICE INTENSIFICATION
| Content Provider | KrishiKosh-Indian National Agricultural Research System |
|---|---|
| Advisor | Padma, V. |
| Researcher | Anjani, Devi B. |
| Abstract | Investigation entitled “Physiological aspects of some rice varieties under system of rice intensification†during Kharif Season (2004) was carried out in sandy loam soil at the College farm, Rajendranagar, Hyderabad. The experiment was laid out in split plot design with two cultivation practices as main treatments and eight varieties as Sub treatments. The results indicate that plant height was not significantly influenced by the methods of cultivation, but significant differences were observed among the varieties at all stages of plant growth. While root length, root volume tillers /plant, leaf area, dry matter accumulation were significantly superior in all varieties under SRI Cultivation, when compared to traditional method of cultivation. But tillers/m2 were recorded less in SRI compared to traditional cultivation. Days to 50% flowering, days to 50% synchronous flowering and days to physiological maturity were reduced by 3-5 days in all the varieties under SRI cultivation, when compared to crop grown under conventional method. Chlorophyll content of leaf (SPAD meter reading) was influenced by cultivation practices. Higher SPAD values were recorded in all varieties under traditional method of cultivation than SRI cultivation. After flowering stage Chlorophyll content of flag leaf depleted rapidly in all varieties under SRI cultivation compared to traditional method. NR activity per gram leaf was less in all varieties under SRI Cultivation compared to varieties under traditional Cultivation, but the NR activity per plant under SRI Cultivation was found to be more due to more number of leaves and leaf area per plant. Grain yield recorded was more under SRI Cultivation compared to traditional method of cultivation. This advantage in grain yield under SRI Cultivation was mainly due to higher panicle weight and more number of filled grains /panicle, higher 1000 grain weight, and decreased spikelet sterility when compared to traditional method of cultivation. Among the eight varieties, Kavya and Erramallelu recorded less grain yield under SRI cultivation, while all the other varieties recorded more yield. Highest grain yield was recorded by Cv. BPT – 5204 (5,909 kg ha-1) under SRI Cultivation and 5532 (Kg ha-1) under traditional method of cultivation, but the percentage increase in grain yield was 6.8 % in SRI cultivation. However highest percentage increase in grain yield was recorded by Early samba (7.9 %) although, the recorded yield was 4130 Kg ha-1 under SRI cultivation over 3825 kgha-1 in traditional method of cultivation. Seed quality parameters like seed viability, seed vigour, and specific gravity of grain were not effected by the cultivation practices. However varietal difference were evident in these parameters but the specific gravity of grain was significant under SRI cultivation compared to traditional method. Azotobacter population count assayed from rhizosphere of rice plant at flowering stage was found to be influenced by cultivational practices. Azotobacter colony forming units for gram of soil was higher in SRI Cultivation compared to traditional method of Cultivation in the present investigation The present investigation reveals that Early samba, BPT-5204 and Swarna are more amenable to the SRI cultivation compared to all other varieties. |
| File Size | 775140 |
| File Format | |
| Language | English |
| Publisher | ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY |
| Publisher Place | Hyderabad Rajendranagar |
| Access Restriction | Open |
| Subject Keyword | Physiological Aspects Some Rice Varieties Under System Intensification |
| Content Type | Text |
| Resource Type | Thesis |
